Aero m5 build parts list

[pnutty]

Hello everyone, 

I am finishing a Aero m5 build and just wanted to see if there would be any issues with the parts combination I chose. I would rather buy the correct parts now than have issues and rebuy new parts later on…

I have read that the Armalite buffer setup is the best for this kind of platform but unfortunately could only find the buffer spring so I tried to recreate the rest of it with other parts.

The rifle is a 6.5 Creedmoor build that will be reloaded for with H4350 and srp brass;

Aero M5 upper and lower

CMMG 308 LPK

UTG pro 308 carbine buffer tube, internal length measure at 7-11/16 deep

EA1095 buffer spring

H3 buffer (was actually listed at 5.6oz but do not have on hand to measure)

BA premium heavy barrel 20” length with rifle gas system

Aero low pro gas block

Aimsports 15” DPMS high handguard mlok

I have not chosen a bcg yet, I would like others opinions before doing so. My only question is whether a 6.5 bolt is need and if the dual ejector setup will ruin brass.

 

Thanks in advance for everyone’s advice.

Edited Tuesday at 12:10 PM by pnutty

[98Z5V]

3 hours ago, pnutty said:

Aimsports 15” DPMS high handguard mlok

Pretty sure the M5 upper is DPMS Low profile...

There are many better ways to do the lower parts kit, as well.

[pnutty]

Thank you for responding, I checked Aero’s website and it did indeed say dpms high tang (.210) for the m5 upper.

For the lower parts kit, besides replacing the trigger and grip, what else could I do? I read that few other manufacturers fit aero lowers as they kept some things different.

[shooterrex]

I have used cmmg lower parts sets with good results.  I also usually change the trigger and grip. Some bolt catches use roll pins and some use a screw. If I remember correctly the Aero uses a screw. The rest of your parts look like they should work just fine.

[98Z5V]

Battle Arms Development has pivot and takedown pins that work perfectly, and come with the detents and springs.  Their bolt catch also works with the M5s, but don't come with the detent and spring.  Their BAD-ASS PRO 60* safety is the best on the market, comes with detent and spring.  After that, you're complete, minus whatever trigger you desire, grip as well, and a bolt catch detent and spring, and whatever you want to run for a mag catch - any AR15 mag catch will work. Your bolt catch is threaded, and the allen bolt should be in the lower already. On your M5 upper, the forward assist is threaded, and the bolt will be in there.  

Edited Wednesday at 02:16 AM by 98Z5V

[pnutty]

I will look into battle arms development, thanks for the source of those parts.

My main question now is about the bolt carrier group, is the 6.5 dual ejector bolt with reduced firing pin a necessity and would you have any suggestions on brands to purchase/avoid? I see that toolcraft makes most of them which could simplify what I get.

One last question would be what size gas port should this barrel have? Its a 20” with rifle gas system and .875 journal, I would rather open it up when it’s apart than test and find out it’s too small and has to be opened up later.

[shooterrex]

Both my 6.5 Creedmoors have standard 308 bolts. I did have to change out the ejector to one with a rounded tip to get one of them to run. Better to try the gas port the barrel comes  with. Then open it up if needed. If it's to big you will need an adjustable gas block.

Tool Craft makes good BCG's

[98Z5V]

3 hours ago, pnutty said:

One last question would be what size gas port should this barrel have?

 

18 hours ago, pnutty said:

BA premium heavy barrel 20” length with rifle gas system

You won't have to worry about the gas port diameter on that barrel, not from BA.  They have their shiit together, in a pretty tight bag.  

[pnutty]

12 hours ago, shooterrex said:

Both my 6.5 Creedmoors have standard 308 bolts. I did have to change out the ejector to one with a rounded tip to get one of them to run. Better to try the gas port the barrel comes  with. Then open it up if needed. If it's to big you will need an adjustable gas block.

Tool Craft makes good BCG's

That good to hear, so no primer flow or whatever they call it into the firing pin channel? That was my main concern and it binding up the bcg.

[pnutty]

13 hours ago, 98Z5V said:

 

You won't have to worry about the gas port diameter on that barrel, not from BA.  They have their shiit together, in a pretty tight bag.  

Great! I did fire off an email to them last night and they spec’d the port diameter to .0785.

[98Z5V]

8 hours ago, pnutty said:

Great! I did fire off an email to them last night and they spec’d the port diameter to .0785.

That's perfect for a 20" rifle gas 6.5, with the 0.875" journal.  It'll run like a Swiss watch.